The AM Forum
April 16, 2024, 04:26:30 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: DOW KEY RELAY  (Read 1103 times)
0 Members and 1 Guest are viewing this topic.
W4AMV
Member

Offline Offline

Posts: 672


« on: February 17, 2023, 02:20:05 PM »

What is the DC coil R for a 110 V dow key relay. The one I have will not pull in although the coil is excited. The coil R I get is
in line with a 2 W rating. Is there an obvious mechanical tweak on these when they fail to pull in?

Thanks,
Logged
W4AMV
Member

Offline Offline

Posts: 672


« Reply #1 on: February 17, 2023, 10:40:15 PM »

This is a DC relay. Do not assume when one states 120 V relay... AC.

Lesson learned.
Logged
W4AMV
Member

Offline Offline

Posts: 672


« Reply #2 on: February 18, 2023, 12:06:24 PM »

Here is the isolation. Better than I expected. On 40 meters above 60 dB. Be prepared to clean Tx contacts, this one was open. De oxit and work the contacts and cycle the relay. The dB loss initially is all over the place! It appears to settle down with cycles. If not, I will build my own. Insertion loss less than 0.1 dB would be nice. Have a VOM at the fest and measure between Ant and Tx port. If you can, manual press the relay arm. Most likely it will show an OPEN. If so, consider a cleaning will be needed.


* dowkey_iso.JPG (126.76 KB, 280x246 - viewed 161 times.)
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.048 seconds with 18 queries.